Only five out of 19 major commercial tuna stocks are being managed to avoid overfishing and restore depleted fish populations — and have earned a passing score for Marine Stewardship Council (MSC) Principle 1 — according to independent scientists in a report published by the International Seafood Sustainability Foundation (ISSF).

The January 2018 version of the report had found that six out of 19 stocks were being managed to avoid overfishing, meaning the situation has not improved in the last year. While South Pacific albacore Principle 1 score has improved thanks to further progress by WCPFC on this stock’s harvest strategy workplan, two other stocks have seen their overall Principle 1 scores worsen: eastern Pacific bigeye due mostly to uncertainties in its latest stock assessment, and Atlantic yellowfin tuna due to weak tools in place to control exploitation that may be hindering its rebuilding plan.

About the Report

An Evaluation of the Sustainability of Global Tuna Stocks takes a consistent, comprehensive approach to scoring tuna stocks against certain components of the Marine Stewardship Council (MSC) standard. The MSC is a global certification program for fisheries.

The report — updated four times since first published in 2013, and organized by individual tuna stock and tuna RFMO — is designed to:

Provide a basis for comparing between stock scores and tuna RFMO scores as assessed by the same experts.

The scores in the report focus on stock status (MSC Principle 1) and the international management aspects relevant to RFMOs (part of MSC Principle 3) and are based on publicly available fishery and RFMO data. Each of these Principles is evaluated in relationship to Performance Indicators (PIs) within each Principle. The Evaluation report also includes detailed remarks on each stock, evaluations of the four RFMOs, and comprehensive reference citations.

MSC Principle 1

The MSC Principle 1 states: “A fishery must operate in a manner that does not lead to overfishing or depletion of the exploited populations and, for those populations that are depleted, the fishery must be conducted in a manner that demonstrably leads to their recovery.”

Regarding stocks receiving passing scores:

Among seven tuna stocks in the Atlantic Ocean, one received an overall principle-level passing score: Northern albacore.

Among eight tuna stocks in the Pacific Ocean, three received overall principle-level passing scores: Western skipjack, Eastern yellowfin and Southern albacore.

Among four stocks in the Indian Ocean, one received an overall principle-level passing score: skipjack.

Regarding stocks receiving failing scores:

In the Pacific, five stocks received overall principle-level failing scores: Western yellowfin, Northern albacore, Eastern bigeye, Eastern skipjack and Western bigeye.

In the Indian Ocean, yellowfin, bigeye and albacore all received overall principle-level failing scores.

In the Atlantic, yellowfin, bigeye, Western skipjack, Eastern skipjack, Southern albacore and Mediterranean albacore all received principle-level failing scores.

Stocks that require rebuilding include Atlantic yellowfin, Atlantic bigeye and Indian Ocean yellowfin.

MSC Principle 3

The MSC Principle 3 states: “The fishery is subject to an effective management system that respects local, national and international laws and standards and incorporates institutional and operational frameworks that require use of the resource to be responsible and sustainable.”

One RFMO —IATTC — received passing scores for all seven performance indicators under Principle 3.

All four RFMOs received overall principle-level passing scores from the authors.

While the report focuses on tuna stock status and sustainability as well as on RFMO policies, it does not address national or bilateral fishing jurisdictions, gear- or fleet-specific ecosystem impacts, or specific fisheries’ ecosystems — all of which are also considered within the MSC assessment methodology.

Since 2011, ISSF has been an active stakeholder in MSC tuna fishery assessments and certifications. ISSF’s strategic objective is to develop and implement verifiable, science-based practices, commitments and international management measures to help all tuna fisheries become capable of meeting the MSC certification standard without conditions.

About the International Seafood Sustainability Foundation (ISSF)The International Seafood Sustainability Foundation (ISSF) is a global coalition of scientists, the tuna industry and World Wildlife Fund (WWF) — the world’s leading conservation organization — promoting science-based initiatives for the long-term conservation and sustainable use of tuna stocks, reducing bycatch and promoting ecosystem health. Helping global tuna fisheries meet sustainability criteria to achieve the Marine Stewardship Council certification standard — without conditions — is ISSF's ultimate objective. To learn more, visit iss-foundation.org, and follow ISSF on Twitter, Facebook and Instagram.